Tips for Buying an Air Purifier

While researching tips for choosing a new water filter, I also started to gather information on selecting the best air purifiers. Just like water filters, I found this subject to be complicated and time consuming! With so many options on the market for consumers, it can be difficult to choose the best fit. For those searching for an air purifier to use in their home, below are a few questions that can help narrow your search more quickly.

Questions to Consider:

What Contaminants Need To Be Filtered? Air purifiers do their work by circulating air through a filter, which may only address some pollutants, or may be capable of handling many at once. So in order to choose the right filter, one should consider what contaminants need to be absorbed out of the indoor environment. Does a member of your family have allergies, or are you more concerned with lowering VOC levels in your home? The table below can help you narrow down what filters are best for your situation.

What is Filtered Out

Description

HEPA

Dust, pet & human dander, allergens.

HEPA (High Efficiency Particulate Air) filters are the most recognized and reliable air filtration technology, capable of trapping particles down to 0.3 microns in size, 99.97% of the time. They are highly recommended by allergists due to their effectiveness.

Carbon

VOCs from household items, odors from humans, pets, cooking, etc.

Carbon filters absorb and retain a wide variety of chemicals, and work well under a wide range of temperature and humidity levels. They are not as effective as HEPA filters for removing particles larger than 0.3 microns.

Ozone Generators

Some indoor air pollutants.

Examples of ozone generators are “filterless” purifiers. The EPA does not consider ozone generators effective in controlling indoor air pollutants, and note that they are not always safe – ozone is a lung irritant that can cause adverse health effects.

How Big is the Space? Air purifiers are equipped to filter a finite amount of space, so the size of the area needs to be considered. Generally speaking, one filtration unit wouldn't be very effective in purifying the air in an entire home, so consider the space dimensions of the rooms you want to purify. Since we all spend so much time in our living room and bedroom (about 1/3 of our lives is spent sleeping!) those are two high impact areas to focus on for filtering. If someone in the family has allergies, you may want to consider purifying the kitchens and bathrooms as well.

Will I Find the Noise to Be Disruptive? A common complaint of air purifiers is that they can be noisy, and the more powerfully they purify, the louder they become. Consider a unit with a slightly larger capacity than necessary, so it can run on a lower setting, or investigate one of the more state-of-the-art filters that specifically address noise issues.

What Do Experts Recommend? When speaking to experts, most recommended a HEPA with an added carbon filter to take care of an array of pollutants in the home. As situations become more unique and the pollutants more specific, different filters should be investigated. The technology for air purifiers is always improving. Current state-of-the-art models allow for noise control, interchangeable filters (based on what particulates need to be removed,) and auto-adjusting capabilities based on contaminant detection.